I was not crazy about everything Chaney did either. For example the play calling during Kentucky loss was a joke (running wildcat on 1st down at Kentucky 7 yard line for example). However, overall I still think Chaney did a very good job - offense improved every year, they brought in good recruits (and good assistants to fix things that were broken -Pittman and Graham for running game, etc).
So even though I agree with what you said about throwing on third and short etc, and the example I listed - I still think we will regret not having that staff once we see what is likely in store going forward. While we can blame Chaney for that Kentucky game don't forget that our new staff had done even worse than that at times - I think I saw somewhere they only scored 3 points vs UConn at home last year - can you imagine how our fans would react to that? I want to be optimistic about the future but I just have a feeling that when they fired Dooley they also threw the baby (offensive staff) out with the bathwater.
I understand Dooley had to go, but the pragmatic approach could have been to keep Chaney and offensive staff intact and just get the new HC who would hire an experience DC and go with that - to me Fulmer and Chavis would make a lot of sense if they would be willing to do this). Let me also add that I give Dooley a lot of credit for being pragmatic and keeping Chaney when he was hired (Chaney was the only leftover from Kiffin's staff if I remember correctly and I think it was critical to do this to have Bray and few other Kiffin's recruits on board and excited when Dooley took over). I also think this may be why he was able to finish in top 10 in recruiting in his first year.